[j-nsp] RTBH

[Charles van Niman]

What route preference is your IGP route, and what IGP? I assume your
discard/static has a route preference of 5? Also, do you mind pasting
the show route extensive output? Is your static discard route in the
same routing-instance/VRF as the BGP prefix?

/Charles

On Thu, Jan 14, 2016 at 3:10 PM, Johan Borch <johan.borch at gmail.com> wrote:
> Hi!
>
> I have implemented RTBH in my small network of 8 routers. DFZ is running in
> a L3VPN and each router has an multihop ibgp-session with my RTBH-router
> and it works, but I have one thing that annoys me.
>
> If I announce an offending IP to be black holed, only one of the routers
> will point to the discard route. The other 7 will see the announced route
> via BGP från the one that got it first I guess and send the traffic to that
> one where is is discarded. If I do show extensive on the route it is prefer
> because of IGP. I can't figure out how to get each router to prefer the
> discard localy. If I do local pref on one router the other 7 will send the
> traffic there instead.
>
> Every router has
>
>      route a.b.c.d/32 {
>             discard;
>             install;
>         }
>
> And from sending RTBH router, they are announced with next-hop a.b.c.d.
>
> Idéas? :)
>
> Regards
> Johan
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